Planetary Transmission Oil Guide for Reverse Splash Lubrication
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Solution Overview
Problem
The existing transmission device suffers from reduced oil-lifting efficiency due to planetary gears rotating in the opposite direction to the carrier, causing oil to splash in an undesirable direction, leading to ineffective lubrication.
Innovation Solution
The transmission device incorporates an oil guide with a semicircular capturing part and guiding recess on the transmission case's outer circumferential wall to capture and direct oil splashed by planetary gears rotating in the reverse direction, ensuring effective lubrication to lubrication targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If planetary gears rotate in the opposite direction to the carrier, then the gear mechanism can function properly, but oil splashes in the opposite direction to the lifting direction, reducing oil-lifting efficiency
Solution Approach 1:
The patent converts the harmful effect of oil splashing in the opposite direction by providing an oil guide structure that captures and redirects the oppositely splashed oil back toward the lubrication targets, thereby transforming the adverse splashing direction into an effective lubrication delivery mechanism
Solution Approach 2:
The oil guide acts as an intermediary element between the planetary gears and the lubrication targets, capturing oil that splashes in the opposite direction and redirecting it to the intended lubrication points, thus mediating the conflict between gear rotation direction and oil lifting efficiency
2Productivity
If planetary gears revolve in the same direction as the carrier, then oil can be lifted effectively, but the gear meshing and differential function cannot be achieved
Solution Approach 1:
The patent accepts that planetary gears must rotate opposite to the carrier for proper meshing, and converts this apparent disadvantage into a workable solution by using the oil guide to capture and redirect the oppositely splashed oil, thereby maintaining both gear function and lubrication effectiveness
Solution Approach 2:
Instead of trying to make the planetary gears rotate in the same direction as the carrier (which would improve oil lifting but break gear meshing), the patent inverts the approach by keeping the gears rotating opposite to the carrier and using the oil guide to invert the oil flow direction back toward the lubrication targets
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The oil guide effectively captures and distributes oil to lubrication targets, enhancing lubrication efficiency even when planetary gears rotate opposite to the carrier's direction, ensuring adequate lubrication for bearings and gears.
Implementation Method 1
the planetary gears revolving in the normal direction of the carrier while rotating in an opposite direction to the normal direction as the carrier rotates in the normal direction
Data Source
AI summary
A transmission device includes a transmission unit housed inside a transmission case with an oil storing part at a bottom part of the transmission case. As viewed in a projection plane orthogonal to a rotation axis of the transmission unit, an oil capturing part is arranged in a semicircle part of an outer circumferential wall of the transmission case. The semicircle part starts at a deepest part of the oil storing part and is positioned on a front side in a normal direction of a carrier.